In Fig. REF c we show the superconducting gap and vortex lattice in pure 2H-NbSe\(_2\)  and in 2H-NbSe\(_{1.8}\) S\(_{0.2}\) . The results in 2H-NbSe\(_2\)  have been obtained repeatedly in the past (see e.g. [1]}, [2]}, [3]}) and correspond to a superconductor having different values of the gap over the Fermi surface. This is somewhat different in 2H-NbSe\(_{1.8}\) S\(_{0.2}\) , which shows a more homogeneous gap distribution. The vortex lattice of 2H-NbSe\(_{1.8}\) S\(_{0.2}\)  loses the sixfold star shape characteristic of 2H-NbSe\(_2\)  and vortices have instead a round shape (bottom insets of Fig. REF c)[4]}.
